Method of coating a device, particularly a heat exchanger tube
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Abstract
A method of making a heat exchanger tube having higher corrosion resistance is provided. The heat exchanger tube includes an Al alloy extruded tube, and a flux layer containing a Si powder and a Zn-containing flux formed on the external surface of the Al alloy extruded tube, wherein an amount of the Si powder applied to the Al alloy extruded tube is not less than 1 g/m2 and not more than 5 g/m2, and an amount of the Zn-containing flux applied to the Al alloy extruded tube is not less than 5 g/m2 and not more than 20 g/m2.
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Citations
10 Claims
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1-4. -4. (canceled)
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5. A method of producing a heat exchanger comprising:
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applying Si powder to an external surface of an Al alloy extruded tube with an extrusion profile including a plurality of internal passages in a quantity of at least 1 g/m2 and not more than 5 g/m2, and further applying an amount of Zn-containing flux mixed with the Si powder, in a quantity of at least 5 g/m2 and not more than 20 g/m2; and
heating the Al alloy extruded tube to a temperature sufficient to fuse the Si powder so as to braze the Al alloy extruded tube to header pipes and fins of the heat exchanger. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification